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为有效考核液体火箭发动机的工作可靠性,需要通过地面试验验证摇摆软管低温疲劳特性。摇摆软管低温疲劳试验系统承担试验时涉及的摇摆环境模拟、低温压力环境模拟、轴压平衡等关键技术。摇摆驱动分系统利用水平放置的2个液压伺服油缸作为驱动单元驱动十字轴带动摇摆软管摆动,模拟摇摆软管的安装边界及摇摆工况。低温压力供应分系统向摇摆软管内腔输送一定压力的液氮,模拟摇摆软管低温以及内压环境。内压平衡子系统通过设置在摇摆软管内的轴压平衡装置平衡内腔压力产生的轴向载荷,避免在内腔压力作用下伸长。某型氧化剂摇摆软管低温疲劳试验结果表明:摇摆软管低温疲劳试验系统能够实现摇摆软管双向摇摆和单向摇摆等疲劳试验工况,试验环境和边界条件与摇摆软管实际工作状态基本一致,试验参数满足要求。
In order to effectively test the reliability of the liquid rocket engine, it is necessary to verify the low temperature fatigue characteristics of the swing hose by the ground test. The swing hose fatigue test system undertakes the key technologies of rocking environment simulation, low temperature pressure environment simulation and axial pressure balance involved in the test. Swing drive subsystem uses two horizontally placed hydraulic servo cylinders as the drive unit to drive the cross shaft to swing the swing hose to simulate the swing hose installation boundary and swing condition. The low-temperature pressure supply subsystem delivers a certain pressure of liquid nitrogen to the swing hose lumen, simulating the low temperature of the swing hose and the internal pressure environment. The internal pressure balance subsystem balances the axial load generated by the lumen pressure through the axial pressure balancing device installed in the swing hose to avoid the elongation under the lumen pressure. The results of low-temperature fatigue tests on a certain type of oxidizer swing hose show that the low-temperature fatigue test system of swing hose can achieve the fatigue test conditions such as bidirectional swinging and unidirectional swinging of the swing hose. The experimental conditions and boundary conditions are basically the same as those of the swing hose , The test parameters to meet the requirements.